Impact Sensor: Testing and Inspection

Crash signal, checking

In the event of an accident (crash) which results in the triggering of the belt tensioner/airbag, the engine control module deactivates the fuel pump relay. Excessive escape of fuel in the event of damage to the fuel system is thus prevented.

As long as the code "Crash deactivation triggered" is stored in the engine control module or is not erased, the fuel pump supply is blocked at "ignition ON" (no generation of preliminary pressure in the fuel system). This can result in a delay when starting the engine.

- Connect test box VAG 1598/31 to wiring harness for engine control module; do not connect engine control module. Testing and Inspection
- Check following wiring connections for open circuit and short circuit to positive or Ground.

Test box VAG 1598/31 Socket Airbag control module Contact
67

Wire resistance: max. 1.5 Ohm

- Correct any open/short circuit as necessary.

If no wiring malfunction is detected:
- Check DTC memory of airbag control module
- Read readiness code. Generate readiness code again if DTC memory was erased. Testing and Inspection